After working with basic HTML elements and CSS selectors, hopefully you’ve noticed a few things along the way. One thing you should be wondering is how to organize the elements of your web pages into logical groups or areas. Navigations are generally in a block at the top of the page or along the side, and pages are centered and have a defined widths, edges, margins, etc.
See the example of this tutorial by clicking this link. Click around to see the finished result of this lab. Keep it open for reference.